Improvement in casting railway-car wheels



NORMAN AYLSWORTH, OF ROCHESTER, NEW YORK.

IMPROVEMENT IN CASTING RAILWAY-CAR WHEELS.

l Specification forming part of Letters Patent No. 16,868, dated March24, 1857.

To all whom it may concern:

Be it known that I, NORMAN AYLswoRTn. of Rochester, in the county ofMonroe and State of New York, have invented certain new and usefulImprovements in u'the Construction of Cores for Foundry Purposes; and Ido hereby declare the following to be a full and accurate description ofmy `invention, reference being had to the accompanying drawings, makingpart of this specilication, and to the letters of reference markedthereon, same letters referring to like parts in all the drawings. .i

In said drawings, Figure l is a perspective View of my improved corereadyfor insertion in the mold. Fig. 2 is a vertical section of thesame. Fig. 3 is a Vertical sect-ion of the core and core-box, showingthe manner of constructing the saine; and Fig 4 is a section of thel hubof a railroad-ear wheel, showing the method of placing the core, andexhibiting its results and advantages.

The nature and objects of this invention consist in so constructing andinserting the core in the hub of the wheel that the sprue or ingate willpass through it to the wheel, and will consequently leave no sprue-markon the outside, while at the saine time, from its being kept hot bymeans of the metal in the hub surrounding it, it remains iiuid to thelast, and allows additional metal to iiow in and make up for theshrinkage which occurs on the cooling of the other parts ofthe wheel.

It will be seen on inspecting the drawings that the core c is madetubular for a portion of its length-namely, to the line b in Fig. et andto the hole g in Fig. fl. The fluid metal passes through this core andreaches the wheel through the horizontal gates g g. It will thus beevident that several very iinportant vadvantages are gained by thisconstruction. Thus it will be seen that from the sprues being surroundedon all sides by the hottest part of the wheel it will be the last tocool, and will consequently supply fluid metal as long as anyis'required to make up for shrinkage, and thus that honeycombed orporous state in which the metal is generally found at the junction ofthe gate or sprue is avoided. `The core is of course dry, so that itdoes not unnecessarily cool the metal, and is constructed in thefollowing manner:

The core-box, Fig. 3, is formed in two parts, divided at right angles tothe line of section shown in the drawings, and has the bottom d, insteadof which, however, the box might be sometimes placed upon any planesurface. Across this core-boX is placed the bar e, which forms the gatesg g, and is supported at each end by the pins p p. The rod i' rests uponthis bar, being kept central by means of the pin I, and forms the holefor the sprue. Sand is now filled in and rammed down in the usual mannerof making cores; the rod r is removed; thenone half of the-corebox istaken away, and the bar e is easily withdrawn. rIhe core is left in theother half of the box, and may be dried in any suitable oven. When themetal is poured in, the solid part at the bote tom of the core receivesit, and thus the core is prevented from rising or being lifted up, whileany cutting action on the part of the met-al does no harm.

By avoiding the junction of the sprue with the hub'of the wheel on theoutside, not only are many car-wheels saved, but a great deal of laboris also prevented from lbeing thrown away, for it often happens thatafter a wheel has been bored and aced,7 as it is called, the face of thehub proves to be so imperfect as to render the wheel useless.

Having thus described my invention, what I claim therein as new, anddesire to secure by Letters Patent, is-

The construction, substantially as herein described, of thev partiallytubular core c for the center of railroad-car wheels, the tubet beingformed to within ashort distance of the end of said core, andcommunicating with the lateral passages g g. f

Vitnesses:

JOHN PLINE, A. K. AMsDnN.

